Writers often portray that Jack may have saved her with his powers because she was a stillborn as a baby and he felt responsible and watched over her, later falling in love with her.These two characters actually, although on the outside seem to be very different have a lot in common personality wise. Their sacrifices and love for their younger siblings (Jack died to save his younger sister; Elsa isolated herself to protect her sister whom she cared about even though it was killing her inside; sacrificing some of her childhood, all of her teen’s years, the start of her adult life just to keep Anna and her family safe from herself), their common change hair color (Jack was born with brown hair before becoming “Jack Frost”, while as the producers of Frozen have confirmed if Elsa wasn’t born with her powers, she would have brown hair as her mother), and their loneliness, isolation (Jack was alone for hundreds of years, unable to interact with someone, while that Elsa was isolated in her room, far away from everyone, keeping herself in isolation). And also their common powers to control snow and ice. They could bond and find comfort in one another over. Jack didn’t interact with someone for years; no one could touch him as he was a spirit, whereas Elsa, locked alone for years in her room, refused to let everyone touch her all in order to protect them. They could find comfort one another knowing they are not alone; to know that there is someone else going through what they are going through.

The two conflicting personalities could definitely lead to some very interesting interactions and tensions. Elsa is quiet, regal, mature and reserved as the perfect Queen, while Jack is very playful, a fun loving, mischievous, and trouble making spirit. His prankster side could succeed in reveal the true personality of Elsa, which is actually more cheerful and less serious, it seems (As can be seen at the end of Frozen). They balance each other out, Elsa showing him the importance of being serious, and Jack showing her the importance of having fun and "letting it go". In the “Shipper’s World”, after the Eternal Winter of Arendelle, Elsa’s again isolated in her Ice palace, to learn to control her powers without damage caused around her. Jack would remain near her, learning to control her powers, later falling in love with her. Or other, Jack would know Elsa since she was a child, and a mysterious and exciting love story could start them. This has become quite a popular ship.

Others try to argue that Jack is over 300 years old, compared to Elsa who is only 21 years old. This is a popular trope in fiction pairing an immortal with a mortal (as an immortal vampire with a simple mortal human), the tragedy of their separation through the test of time a preferable tool for drama and tragedy.

Like Janna, people have portrayed this relationship starting out with a very young Elsa and Jack enjoying each other's company in a similar manner to that of a little girl and her imaginary friend, the reality of what they have sinking in as she comes of age.

Also, this pairing is commonly shipped for those who like Eugunzel and Annoff or widely known as Kristanna, Anna and Kristoff (but mostly Anna) actively assisting their relationship.